/*
 * Copyright (c) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.api.client.http;

import com.google.api.client.util.Preconditions;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

/**
 * Concrete implementation of {@link AbstractInputStreamContent} that generates repeatable input
 * streams based on the contents of a file.
 *
 * <p>
 * Sample use:
 * </p>
 *
 * <pre>
 * <code>
  private static void setRequestJpegContent(HttpRequest request, File jpegFile) {
    request.setContent(new FileContent("image/jpeg", jpegFile));
  }
 * </code>
 * </pre>
 *
 * <p>
 * Implementation is not thread-safe.
 * </p>
 *
 * @since 1.4
 * @author moshenko@google.com (Jacob Moshenko)
 */
public final class FileContent extends AbstractInputStreamContent {

  private final File file;

  /**
   * @param type Content type or {@code null} for none
   * @param file file
   * @since 1.5
   */
  public FileContent(String type, File file) {
    super(type);
    this.file = Preconditions.checkNotNull(file);
  }

  public long getLength() {
    return file.length();
  }

  public boolean retrySupported() {
    return true;
  }

  @Override
  public InputStream getInputStream() throws FileNotFoundException {
    return new FileInputStream(file);
  }

  /**
   * Returns the file.
   *
   * @since 1.5
   */
  public File getFile() {
    return file;
  }

  @Override
  public FileContent setType(String type) {
    return (FileContent) super.setType(type);
  }

  @Override
  public FileContent setCloseInputStream(boolean closeInputStream) {
    return (FileContent) super.setCloseInputStream(closeInputStream);
  }
}
